<!DOCTYPE html>
<html lang="en">
    <head>
        <style>
            #qr {
                margin: 0 auto;
                width: 300px;
                height: 100%;
            }
        </style>
        <script src="jquery-1.12.4.min.js"></script>
        <script src="jquery.qrcode.min.js"></script>
        <script src="qr.js"></script>
    </head>

    <body>
        <div id="qr"></div>
    </body>
</html>
